.content-container{
    z-index: 2;
    position:absolute;
    width: 400px;
    height: 400px;
    border-radius: 45px;
    background: rgba(0, 0, 255, 0.5);
    box-shadow: 0px 0px 5px #333333;
    top: 50%;left: 50%;
    margin-top: -250px;
    margin-left: -175px;
    transition: all 1s;
    -moz-transition: all 1s;
    -webkit-transition: all 1s;
    -o-transition: all 1s; 
}